Having actually worked at Medicity (later acquired by Aetna) I had the not so great priviledge of integrating Medicity's health record systems with both Google

Having actually worked at Medicity (later acquired by Aetna) I had the not so great priviledge of integrating Medicity's health record systems with both Google Health and Microsoft Healthvault. Neither gained the adoption rate that was anticipated by anyone. Medicity did a great job working towards more unified systems from all the siloed systems but it's (as others in healthcare have noted) notoriously complex and ever changing.